KR100573426B1 - Portable leak detecting device for oil storage tank - Google Patents

Abstract

The present invention relates to a mobile leak inspection apparatus for an oil storage tank, comprising a gas supply unit (10) for supplying a leak inspection gas at a constant pressure, and a gas (1) selectively supplied from the gas supply unit (10). Gas which is installed so as to discharge into the lowest surface of the liquid portion (L) in which the oil is stored therein and into the gas phase portion (G) or the oil pipe (5) formed in the upper layer of the liquid portion (L) to form a gas discharge passage The pressure change amount of the liquid phase part L inside the tank 1 and the internal pressure of the gas phase part G that are connected to the discharge pipe part 20 and the gas discharge pipe part 20 to discharge gas for leak inspection. Detects the change amount or the change in the internal pressure of the oil supply pipe, and at the same time detects the atmospheric pressure acting at this time, and the pressure change amount detected by the detection unit 30 by recording and calculating the liquid phase of the tank (1) Section (L), meteorological section (G) and oil pipeline (5) Comprising a calculation unit 40 for visualizing whether the discharge, calculate the amount of pressure change per unit time to calculate the amount of leakage and leakage of the liquid portion (L) in which the oil is stored in the tank, and also the gas phase of the tank (G) ) And the internal pressure change amount of the oil supply pipe 5 to calculate the leakage of the tank more quickly and accurately.

Tank, leak inspection

Description

Portable leak detector for oil storage tanks {PORTABLE LEAK DETECTING DEVICE FOR OIL STORAGE TANK}

1 is a schematic view of a mobile leak inspection apparatus for an oil storage tank of the present invention,

2 shows a regulator used in the present invention,

3 is a view showing a blue valve used in the present invention,

4 shows a chamber used in the present invention,

5 shows a probe used in the present invention.

6 shows a bidirectional pressure sensor used in the present invention;

7 is a view showing a liquid leakage test state inside the tank using a mobile leak inspection apparatus for an oil storage tank of the present invention,

8 is a view showing a leak detection state of the gas phase inside the tank using a mobile leak inspection apparatus for an oil storage tank of the present invention;

9 is a view showing a leak inspection state of the oil supply pipe using a mobile leak inspection apparatus for an oil storage tank of the present invention,

** Explanation of symbols for the main parts of the drawings **

1: tank 2: manhole

3: probe 4: ventilation tube

5: oil supply pipe 5a: oil supply pipe

5b: oil supply line 10: gas supply part

11: nitrogen tank 12: regulator

20: gas discharge piping 21: supply tube

22: blue valve 23: connecting tube

24: chamber 24a: body part

24b: fixed part 24c: inlet pipe

24d: discharge tube 24e: on-off valve

24f: Packing member 24g: Fixing nut

25: discharge tube 26: probe

26a: body 26b: magnetic material

26c: through hole 26d: discharge port

30: sensing unit 31: sensor case

32; Bi-directional pressure sensor 33: circuit board

34: data input cable 35: carrying case

40: calculator

The present invention relates to a mobile leak inspection apparatus for an oil storage tank, and more particularly, a pressure change amount of a liquid portion stored in a tank per unit time and an internal pressure of a gas phase portion formed in an oil upper layer by injecting nitrogen gas for inspection into a tank at a predetermined pressure. The present invention relates to a mobile leak inspection apparatus for an oil storage tank, which calculates a change amount and a change in internal pressure of a gas discharge pipe part so that a leak inspection of the oil storage tank can be performed more accurately.

In general, oil storage tanks are used to store oil or chemicals at gas stations or factories, and the structure and installation method of the tanks are determined according to the type of oil stored therein. Are regulated by relevant laws and regulations.

In particular, the oil tank used at the gas station is mainly buried underground in consideration of safety. Therefore, the oil stored inside the tank leaks due to corrosion or cracks caused by external pressure, which causes serious environmental pollution such as soil pollution and groundwater contamination, but it is difficult to check whether it leaks because it is buried underground.

 In addition, in the case of oil storage tanks installed indoors or outdoors, leaks through fine cracks could not be coped with positively because it is difficult to directly check whether or not leaks through safety protection or tanks are installed.

Therefore, it is easy to move so as not to be restricted by the installation position of the tank to perform the leak inspection of the oil storage tank, and it is highly adaptable according to the capacity of the tank, and leaks for a short time so as not to be restricted by the use of the tank. There is a need for a leak inspection apparatus capable of performing an inspection.

However, the leak test apparatus for oil storage tanks used in the related art has been inevitably relying on a level gauge for checking the oil level in the tank, and this level gauge is used to measure the oil level stored in the tank. In the case of commonly used buoys and ultrasonics, it was not possible to predict the volume change of the storage oil according to the change of temperature or vibration, so that accurate leak inspection could not be performed.

Therefore, even conventional ultrasonic, photoelectric, or laser leak inspection devices used for more accurate leak inspection are vulnerable to noise and vibration, making it difficult to carry out accurate leak inspection as well as expensive and difficult to use. The time required for 4 to 5 hours or more requires a relatively large amount of inspection time, the use of the tank is restricted, there is a problem that the mobility is inferior as the mobile vehicle is required more than the minimum size of vans.

In addition, since it is applied only to a tank having an opening of a predetermined size or more according to the type of the probe inserted into the tank to perform the leak inspection, there is a problem in that it is restricted according to the capacity and type of the various tanks.

In addition, there is a problem in that the tank must be emptied for leak inspection, or the use of the tank must be stopped during measurement.

The present invention devised to solve such a problem is not only to perform accurate leak inspection irrespective of external factors such as noise and vibration, but also to reduce the cost required for leak inspection.

In addition, it is intended to solve the problem of the temporary position of the tank or the space constraints necessary for the inspection by configuring the leak inspection equipment in a portable form to facilitate the movement of the equipment.

In addition, a leak inspection of a tank having various types and capacities is performed by configuring a probe inserted into the tank and a gas discharge pipe connecting the probe to be applied to tanks having different capacities and shapes in order to perform a leak inspection. It has a purpose.

It also aims to solve the problem of using the tank, which must be shut down during measurement by performing accurate leak inspection in a short measurement time.

In addition, the leak check of the oil and gas and the liquid phase of the oil stored in the tank, as well as the oil supply pipe line disposed in the tank in parallel to perform a multi-face leak test.

In order to achieve the above object, the mobile leakage inspection apparatus for an oil storage tank of the present invention is a gas supply unit for supplying a leak inspection gas at a constant pressure, and the gas supplied from the gas supply unit selectively oil in the tank A gas discharge pipe portion which is formed to discharge into a gas phase part or an oil supply pipe formed at an upper layer of the liquid phase part, a gas discharge path, and a gas discharge pipe connected to the gas discharge pipe part; The sensing unit detects the pressure change amount of the liquid phase inside the tank and the gas pressure change amount of the gas phase part or the internal pressure change amount of the oil supply pipe, and simultaneously detects the atmospheric pressure acting at this time, and records the pressure change amount detected by the detection part. And visualizing whether the liquid phase and the gas phase part and the oil supply pipe of the tank are leaked. It is characterized by consisting of a calculation unit.

In addition, the gas supply unit is characterized by consisting of a nitrogen tank for storing the nitrogen gas, and a regulator for varying the pressure for supplying the nitrogen tank to the set pressure required for the leak test.

The gas discharge pipe part may further include: a supply tube connecting the gas supply part and the sensing part; A connection tube branched from the supply tube, a chamber having respective flow paths for selectively discharging the gas introduced and connected to the connection tube to the liquid phase or the gas phase portion in the tank, and connected to the chamber in communication with the chamber. A discharge tube hypothesized to the lowest surface of the stored liquid portion, a probe coupled to an end of the discharge tube to discharge gas from the lowest surface of the liquid portion, and installed on a line of the supply tube to provide a nitrogen gas pressure and a liquid In order to sense the pressure change of the lowest surface of the liquid part in the closed state while operating the pressure acting on the lowest surface of the negative portion to equilibrate, so that the nitrogen gas from the probe to fall into the bubble form with a small pressure difference It is characterized by consisting of a blue valve.

In addition, the chamber has a body portion having a predetermined internal space, a fixed portion extending in communication with the body portion to form a gas discharge part side discharge path therein, and extends in communication with the body portion to communicate with the connecting tube The inlet pipe, which is branched from the inlet pipe, penetrates the body portion and the fixed portion, and forms a liquid discharge side discharge path so as to be connected to the discharge tube; An opening / closing valve for discharging to the gas phase part discharge path inside the fixing part or through the discharge tube through a part, a fixing nut spirally coupled to rotate in a longitudinal direction on an outer circumferential surface of the fixing part, and the fixing It is a packing member that is pressurized according to the conveying direction of the nut and expands and contracts in the center direction. Characterized in that configured.

The probe may include a body formed through a discharge hole having a predetermined depth therein and having a predetermined inclination angle at an end of the through hole to be coupled to communicate with the discharge tube; It is characterized in that the magnetic body for extending and coupled to the body to attach the body to the tank bottom surface.

In addition, the discharge tube is characterized in that the flexible tube is configured to be stretchable according to the depth of the tank.

In addition, the sensing unit and the operation unit is characterized in that formed in one single module.

In addition, the detection unit is characterized in that it is provided with a bi-directional pressure sensor for detecting the amount of gas pressure change in the pipe connected to the supply tube and at the same time the atmospheric pressure acting at this time.

Hereinafter, with reference to the accompanying drawings an embodiment of a mobile leak inspection apparatus for an oil storage tank of the present invention will be described.

1 is a schematic view of a mobile leak inspection apparatus for an oil storage tank of the present invention, Figure 2 is a view showing a regulator used in the present invention, Figure 3 is a view showing a blue valve used in the present invention, Figure 4 is a view showing a chamber used in the present invention, Figure 5 is a view showing a probe used in the present invention, Figure 6 is a view showing a bidirectional pressure sensor used in the present invention, Figure 7 It is a figure which shows the leak state of the liquid-phase part inside a tank using the portable leak test apparatus for oil storage tanks of this invention, and FIG. 8 is a leak test state of the gaseous part inside a tank using the portable leak test apparatus for oil storage tanks of this invention. 9 is a view showing a leak inspection state of the oil supply pipe using a mobile leak inspection device for an oil storage tank of the present invention.

As shown in FIG. 1, the mobile leak inspection apparatus for an oil storage tank of the present invention performs a leak test on a gas supply unit 10 for supplying a gas of a constant pressure and a gas supplied from the gas supply unit 10. A gas discharge pipe portion 20 arranged to supply the liquid portion L, the gas phase portion G, or the oil pipe 5 inside the tank 1 to be connected to the gas discharge pipe portion 20; Sensing unit for detecting the pressure change amount of the liquid portion (L) and the internal pressure change amount of the gas phase portion (G) or the internal pressure change amount of the oil supply pipe (5) at the same time, and at the same time the atmospheric pressure acting at this time (30) and by recording and calculating the respective pressure change detected by the sensing unit 30, whether the liquid phase part (L) and the gas phase part (G) in the tank (1) and the oil supply pipe (5) It is composed of a calculation unit 40 for visualizing whether the leak.

The tank (1) is an oil storage tank (1) buried underground to store the oil at a gas station, etc., the liquid portion (L) in which the oil is stored at a predetermined level in a container having an accommodation space therein, and an upper portion thereof. A gaseous-phase part G filled with volatile components of air or oil is formed in a layer, and oil-feeding such as an oil supply pipe 5a and an oil supply pipe 5b installed to flow oil into and out of the tank 1. Piping (5), a ventilating pipe (4) installed for ventilation inside the tank (1), and a probe hole (3) located inside the manhole (2) to check the level of stored oil in the tank (1) Is provided.

The gas supply unit 10 supplies nitrogen to the gas discharge pipe unit 20 hypothesized into the tank 1 through the probe hole 3 of the tank 1 or nitrogen into the oil supply pipe 5. A nitrogen tank 11 for pressurizing and storing nitrogen gas inside the pressure vessel to supply gas, and a regulator 12 for varying the nitrogen gas supplied from the nitrogen tank 11 to a set pressure required for leak inspection.

Nitrogen gas used here is merely one example of an inspection medium that can observe the change by applying a set pressure necessary for leak inspection in the tank 1 and the oil supply pipe 5, and the oil stored in the tank 1 It is more preferable to selectively use an inert gas capable of maintaining chemical stability depending on the type.

As shown in FIG. 2, the regulator 12 includes an inlet tube 12a and a discharge tube 12b provided at both sides to be connected to the nitrogen tank 11 and the gas discharge pipe 20. The pressure reducing lever 12c is provided between the inlet pipe 12a and the discharge pipe 12b to adjust the pressure of the nitrogen gas so as to supply the nitrogen gas at a pressure necessary for leak inspection.

 In addition, an inlet pressure gauge 12d showing the pressure of the nitrogen gas flowing into the inlet pipe 12a and a discharge side gauge 12e showing the pressure of the nitrogen gas supplied through the discharge pipe 12b are provided. Lose.

In addition, the gas discharge pipe 20 is a supply tube 21 for connecting the gas supply unit 10 and the detection unit 30; The connection tube 23 branched from the supply tube 21, the gas connected to the connection tube 23 is selectively discharged to the liquid phase part L or the gas phase part G in the tank 1. A chamber 24 having respective discharge paths formed thereon, a discharge tube 25 connected to the chamber 24 and installed to the lowest surface of the liquid portion L stored in the tank 1, and the discharge tube. Is coupled to the end of the 25 consists of a probe 26 to allow nitrogen gas to be discharged from the lowest surface of the liquid portion (L).

In addition, the detection unit 30 in the closed state and the opening operation so as to balance the pressure of the nitrogen gas inside the probe 26 and the pressure acting on the lowest surface of the liquid phase (L) on the supply tube 21 line. In order to detect the pressure change amount of the lowest surface of the liquid portion (L) in the probe 26 is provided with a blue valve 22 to allow nitrogen gas to be discharged in the form of bubbles with a small pressure difference.

In addition, the discharge tube 25 is preferably composed of a flexible tube that can be stretched to correspond to the depth of the tank (1) to perform the leak test.

As shown in FIG. 3, the blue valve 22 is composed of tube coupling parts 22b and 22c to which the supply tube 21 is coupled at both ends, and a valve 22a to be coupled between the tube coupling parts. do.

As shown in FIG. 4, the chamber 24 extends and is coupled to communicate with the body portion 24a having a predetermined internal space and communicates with the body portion 24a to form a gas phase part discharge passage 24h therein. In addition, it consists of a fixing portion (24b) that is inserted and fixed to the probe hole (3) or the oil supply pipe (5) of the tank (1).

The body portion 24a is branched from the inlet tube 24c for communicating with the connecting tube 23 and the inlet tube 24c, and vertically penetrates the body portion 24a and the fixing portion 24b. And a discharge tube 24d for forming a liquid-side-side discharge path.

In addition, the nitrogen gas flowing into the inlet pipe 24c and introduced into the inlet pipe 24c passes through the body part 24a to the gas phase part discharge path 24h formed inside the fixing part 24b. An on / off valve 24e for discharging or discharging through the liquid-side discharge path formed in the discharge tube 24d is provided.

On the outer circumferential surface of the fixing portion 24b is a fixing nut 24g which is helically coupled in a longitudinal direction so as to be pivotally transported, and a packing member 24f which is pressurized during the rotational movement of the fixing nut 24g to be stretched in the center direction. Is done.

As shown in FIG. 5, the probe 26 has a through hole 26c formed in a predetermined depth so as to communicate with the discharge tube 25, and a discharge hole 26d having a predetermined inclination angle at an end of the through hole 26c. ) Is formed of a body 26a formed therethrough and a magnetic body 26b coupled to a lower end of the body 26a to attach the body 26a to the bottom surface of the tank 1.

As the diameter of the body 26a of the probe 26 is made to be 20 mm or less, when the probe hole 3 of the tank 1 to be leaked is about 20 mm in size, the leak test can be performed. Even if the probe hole 3 of the tank 1 is not provided, the oil supply pipe 5 or the other ventilation pipe 4 such as the oil supply pipe 5a, the oil supply pipe 5b, etc., into which the probe 26 can be inserted, is also provided. It is also possible to carry out leak checks.

As shown in FIG. 6, the sensing unit 30 includes a supply tube 21, a connection tube 23, a discharge tube 25, a blue valve 22, and a chamber of the gas discharge pipe 20. 24) a sensor case 31 fixed to an inner side of the moving case 35 for moving and so on, and fixed inside the sensor case 31 to open the supply tube 21 and one end to the atmosphere. The open tube 28 is connected to each other so that the pressure change amount in the liquid phase part L and the gas phase part G in the tank 1, the pressure change amount in the oil supply pipe 5, and the atmospheric pressure acting at the time of leak inspection It consists of a bi-directional pressure sensor 32 that can be detected at the same time, and a circuit board 33, the circuit is configured for transmitting data to each of the pressure values detected from the bi-directional pressure sensor 32 to the calculation unit 40.

The bidirectional pressure sensor 32 is configured to have a temperature range of −20 to 50 ° C., a pressure range of 0.036 to 2.627 kg / cm 2, an operation start time of 800 ms, and a maximum sensing speed of 200 ms.

The calculation unit 40 is connected to the circuit board 33 and the data input cable 34 of the sensing unit 30 to record and calculate the pressure values detected from the bidirectional pressure sensor 32 by a predetermined number of times per unit time. It consists of a portable computer that can be visualized to determine whether the leakage according to the pressure change of the liquid phase (L) and gas phase (G) and the oil supply pipe (5) inside the tank (1).

In addition, in order to improve the mobility of the leak inspection apparatus, it is preferable to form the sensing unit 30 and the calculating unit 40 as one unit module, and at this time, the calculating unit on the circuit board 33 of the detecting unit 30. It is more preferable to additionally configure the circuit to perform the recording, calculation and display functions of the data performed at 40.

Hereinafter, the present invention having the above-described configuration will be described in detail the operation and effect of the mobile leak inspection apparatus for oil storage tanks.

First, in order to perform a leak test of the tank 1, as shown in Figure 1, the regulator 12 and the bidirectional pressure sensor 32 at both ends of the supply tube 21 is provided with a blue valve 22 on the line. ) Are connected to each other, and the connection tube 23 branched from the supply tube 21 is connected to the inlet pipe 34c of the chamber 24, and the discharge tube 24d of the chamber 24 is connected to the inlet pipe 34c. The connection tube 23 is connected, and the probe 26 is connected to an end of the discharge tube 25.

Then, the discharge tube 25 is inserted into the tank 1 probe hole 3 so that the magnetic body 26b of the probe 26 is attached to the bottom surface of the tank 1, and then the chamber 24 By rotating the fixing nut 24g so that the packing member 24f provided in the fixing portion 24b extends toward the outer circumference thereof, the chamber 24 is hermetically fixed to the probe hole 3 of the tank 1. Complete the installation of the mobile leak detector.

First, referring to the process of performing a leak test of the liquid portion (L) in which oil is stored in the tank 1 using the mobile leak test apparatus of the present invention, by opening the valve of the nitrogen tank 11 to regulate the nitrogen gas ( 12), and the nitrogen gas supplied to the supply tube 21 is supplied at the set pressure required for the leak inspection by operating the pressure reducing lever 12c of the regulator 12. At this time, the pressure of the nitrogen gas supplied from the nitrogen tank 11 and the pressure of the nitrogen gas supplied to the supply tube 21 can be confirmed through the inlet gauge 12d and the discharge gauge 12e of the regulator 12. have.

As shown in FIG. 7, the nitrogen gas supplied to the supply tube 21 passes through the blue valve 22 and then passes through the connection tube 23 branched from the supply tube 21 to the chamber 24. Nitrogen gas introduced into the inlet tube 24c of the chamber 24 and operated through the on / off valve 24e installed in the inlet tube 24c in a closed state is introduced into the discharge tube 24d of the chamber 24. N, and the nitrogen gas discharged into the discharge tube 24d is discharged through the discharge tube 25 to the discharge port 26d of the probe 26 at the lowest surface of the oil stored in the tank 1 through the discharge tube 25. .

The blue valve 22 is completely opened to blow the oil granulated to the discharge tube 25 through the discharge port 26d of the probe 26 with nitrogen gas due to the pressure of the oil stored in the tank 1 for leak inspection. It is operated so that the blue valve 22 is gradually closed so that the pressure of nitrogen gas and the lowest surface pressure of the oil are balanced at the discharge port 26d of the probe 26.

Then, when the pressure between the nitrogen gas and the lowest surface of the oil is in equilibrium at the discharge port 26d of the probe 26, the blue valve 22 is completely closed so that the nitrogen gas is supplied with a small pressure difference, and the discharge port of the probe 26 is supplied. At 26d, small bubbles are formed and allowed to be continuously released.

The pressure at the moment when nitrogen gas breaks the equilibrium with the pressure of the lowest surface of the oil and is discharged as a small bubble drop at the discharge port 26d of the probe 26, is equal to the pressure acting on the lowest surface of the oil acting outside the bubble. .

At the moment when nitrogen gas is discharged into the small bubble, the pressure of the discharge port 26d of the probe 26 is determined by the Pascal principle. The discharge tube 25, the chamber 24, the connection tube 23 and the supply tube ( 21) is the same as the gas pressure inside the gas discharge pipe portion 20.

Therefore, the tank by detecting the instantaneous pressure of the nitrogen gas bubble is released from the discharge port 26d of the probe 26 by the bidirectional pressure sensor 32 of the detection unit 30 connected to the supply tube 21. The pressure value at the lowest surface of the oil stored in (1) and the atmospheric pressure at this time can be obtained simultaneously.

Pressure values of the pressure and atmospheric pressure acting on each of the oil bottom surfaces obtained by the bidirectional pressure sensor 32 are converted into electrical signals through a circuit board 33 provided in the sensing unit 30 to convert the data input cable 34. It is input to the operation unit 40, that is, connected to the portable computer.

The portable computer subtracts the atmospheric pressure (P _air ) acting at this time from the _total pressure (P _total ) acting on the oil bottom surface, as shown in Equation 1, to generate the net by the mass of the oil stored in the tank 1. Calculate the oil pressure (P _oil ).

는 유류 최저면에 작용하는 압력이고,

는 대기압이며,

는 유류의 질량에 의해 발생되는 순 유류 압력이다. here,

Is the pressure acting on the oil bottom surface,

Is atmospheric pressure,

Is the net oil pressure generated by the mass of the oil.

Then, the pressure value of the oil obtained by a certain number of times per unit time is sampled to calculate the pressure change amount (ΔP _oil ) of the _oil , and as shown in Equation 2, the measured pressure change amount (ΔP _oil ) of the _oil measured at the time of leak test Multiply the specific gravity value (γ _oil ) corresponding to the temperature of the _oil to calculate the amount of _oil leakage (Δh _oil ) per unit time.

는 유류의 압력 변화량이고,

는 유류의 비중값이며,

는 유류 누출량이다. here,

Is the pressure change of the oil,

Is the specific gravity of the oil,

Is the oil leakage.

Therefore, when the oil pressure change amount ΔP _oil is generated as much as the oil stored in the tank 1 leaks, it can be seen that leakage occurs in the liquid portion L in which the oil is stored in the tank 1, or leaks per unit time. The amount of _oil leaked (Δh _oil ) can be seen.

In this case, the calculation unit 40 receives and stores data about respective pressure values detected and input from the bidirectional pressure sensor 32 of the detection unit 30 in units of about 0.2 seconds, and stores at least 1000 stored data. By selectively sampling and calculating to accurately calculate the pressure change and leakage of the liquid to visualize to determine whether the leakage occurs in the liquid phase (L) of the tank (1).

Therefore, the leak inspection can be performed regardless of the change in the temperature of the oil stored inside the tank 1 and the volume change of the oil caused by the noise and vibration, and in particular, the leak amount of the leaked oil per unit time can be known. To be able to cope.

In addition, as shown in FIG. 8, in order to perform leak inspection of the gas phase part G of the tank 1, the ventilation pipe and the oil supply pipe 5 are sealed with a sealing member (not shown) so that the tank 1 is sealed. The nitrogen gas introduced through the inlet pipe 24c of the chamber 24, which is hermetically fixed to the probe hole 3 of the tank 1, is inside the body 24a and the fixing part 24b of the chamber 24. The opening / closing valve 24e is opened to flow into the gas phase part G of the tank 1 via the gas phase part discharge path 24h formed in the gas phase part.

When the nitrogen gas discharged through the chamber 24 to the gas phase part G of the tank 1 reaches the test pressure, the pressure of the gas phase part G of the tank 1 reaches the test pressure 12c of the regulator 12. ) To close the injection of nitrogen gas, and to measure the change in the internal pressure with the bidirectional pressure sensor 32 of the sensing unit for a predetermined time to perform a leak test.

In addition, as shown in Fig. 9, an example of leak inspection of the oil supply pipe 5b, which is installed to drain oil into the tank 1 in the oil supply pipe 5, will be described. After the exposed connection part is separated, the fixing part 24b of the chamber 24 is inserted into the oil supply pipe, and then the fixing nut 24g is rotated to seal the packing member 24f. Then, the other end is sealed to prepare for leak inspection.

And, similar to the leak test of the gas phase portion G of the tank 1 described above, the oil supply pipe (through the gas phase portion discharge path 24h formed in communication with the body 26a portion and the fixing portion 24b of the chamber 24) 5) After supplying nitrogen gas to the inside, pressurize the inside of oil pipeline 5 so that the pressure is set to the set test pressure.

Hereinafter, a simulated leak test of the oil storage tank is performed using the mobile leak test apparatus for the oil storage tank of the present invention.

However, the simulated leak test defines the leak detection performance characteristics and limitations of various leak detection devices, while the settling time, tank capacity, suitable product level, leak detection success rate and failure rate can be compared with other leak detection devices. In order to consider this as a measure of compliance, it was implemented in accordance with regulations adopted by the US EPA Protocol.

First simulated leak test result

First simulated leak test conditions Tank capacity 45,000ℓ Tank diameter 2,430ℓ Depth of storage oil 2,149 mm (93.56% full) Types of storage oil Diesel oil (S.G.: 0.835)

Under simulated leak test conditions shown in Table 1, the leak pressure is 10.3 kPa (1.5 psi), the water pressure at the bottom of the tank, that is, the pressure at the bottom of the fluid is 17.60 kPa, and the gauge pressure applied at the tank bottom is 27.90 kPa (10.3+). 17.63), the rate at which leakage increased under pressure during the simulated leak was 1.58 (27.90 / 17.6), and the actual leak rate for tanks of the same capacity was 0.239 l / hr (0.3785 / 1.58). Therefore, it can be seen that the mobile leak inspection apparatus for the oil storage tank of the present invention shows a leak detection success rate of 100% in a simulated leak test of 0.3785 L per hour.

Second simulated leak test result

First simulated leak test conditions Tank capacity 10,000ℓ Tank diameter 1,666ℓ Depth of storage oil 1,100 mm (70% full) Type of storage oil Diesel oil (S.G.: 0.835)

The leak pressure measured under simulated leak test conditions shown in Table 2 is 10.3 kPa (1.5 psi), the water pressure at the bottom of the tank, ie the pressure at the bottom of the fluid, is 9.01 kPa, and the gauge pressure applied at the tank bottom is 19.31 kPa ( 10.3 + 9.01), 2.142 (19.31 / 9.01) increased leak rate under pressure during simulated leaks, and the actual leak rate for tanks of the same capacity is 0.0883 L / hr (0.189 / 2.142). Therefore, it can be seen that the mobile leak inspection apparatus for the oil storage tank of the present invention also shows a leak detection success rate of 100% even in a simulated leak test of 0.189 l / hr.

The mobile leak inspection apparatus for an oil storage tank of the present invention having such a configuration can perform a more accurate leak inspection regardless of external factors such as noise and vibration, as well as reduce the cost required for leak inspection.

In addition, by configuring the equipment in a portable form to facilitate the movement to solve the problems caused by the movement of the equipment can be effectively conducted leak inspection without the constraints of the space of the tank temporary position or inspection required.

In addition, to perform a leak test, a probe inserted into the tank and a discharge tube connecting the probe may be configured to be applicable to all tanks having different capacities and shapes, thereby performing leak inspection of tanks having various types and capacities. Has the effect.

In addition, it is possible to solve the problem of using the tank that must be shut down during measurement by performing accurate leak inspection in a short measurement time.

In addition, there is an effect that can be carried out in parallel with the leakage inspection of the pipe line, such as the oil supply pipe disposed in the tank, as well as the liquid and gas phase of the oil stored in the tank.

Claims (8)

delete delete A gas supply unit 10 for supplying a leak inspection gas at a constant pressure; The gas supplied from the gas supply unit 10 is selectively provided with the lowest surface of the liquid portion L in which oil is stored in the tank 1, and the gas phase portion G or the oil pipe formed on the upper layer of the liquid portion L. (5) a gas discharge pipe portion 20 which is installed to be discharged into the inside to form a gas discharge path; The amount of pressure change in the liquid phase part L and the internal pressure change amount in the gas phase part G or the internal pressure change amount in the oil supply pipe connected to the gas discharge pipe part 20 to discharge gas for leak inspection. A sensing unit 30 that senses and simultaneously senses the atmospheric pressure acting at this time; Comprising a calculation unit 40 for visualizing the leakage of the liquid phase (L) and the gas phase (G) and the oil supply pipe (5) of the tank (1) by recording and calculating the amount of pressure change detected by the detection unit (30) In the portable leak inspection device for the oil storage tank to be The gas discharge pipe part 20 includes a supply tube 21 connecting the gas supply part 10 and the detection part 30; A connection tube 23 branched from the supply tube 21; A chamber 24 having respective flow paths for selectively discharging the gas introduced by being connected to the connection tube 23 to the liquid phase part L or the gas phase part G in the tank 1; A discharge tube 25 communicatively coupled to the chamber 24 and hypothesized to the lowest surface of the liquid portion L stored in the tank 1; A probe 26 coupled to an end of the discharge tube 25 to discharge gas from the lowest surface of the liquid portion L; It is installed on the line of the supply tube 21 is operated to open the equilibrium between the pressure of the nitrogen gas in the inside of the probe 26 and the pressure acting on the lowest surface of the liquid portion (L) and the detection unit in the closed state ( The oil is characterized in that it consists of a blue valve 22 so that the nitrogen gas in the probe 26 is separated into a bubble form with a small pressure difference to detect the pressure change amount of the lowest surface of the liquid portion (L) in 30) Mobile leak detector for storage tanks. The method of claim 3, wherein The chamber 24 includes a body portion 24a having an internal predetermined space; A fixing part 24b extending and coupled to the body part 24a to form a gas phase part discharge path 24h therein; An inlet pipe 24c extending from the body portion 24a so as to communicate with the connection tube 23; A discharge tube (24d) branched from the inlet tube (24c) to form a flow path through the body portion (24a) and the fixing portion (24b) to be connected to the discharge tube (25); The gas introduced on the inlet pipe 24c line is discharged to the gas phase part discharge path 24h inside the fixed part 24b through the body portion 24a or through the discharge pipe 24d. An on / off valve 24e for discharging; Fixing nut (24g) is coupled to the spiral so as to be rotated in the longitudinal direction on the outer circumferential surface of the fixing portion (24b), and pressed in accordance with the conveying direction of the fixing nut (24g) is stretched in the center direction and the tom of the tank (1) Mobile leakage inspection device for an oil storage tank, characterized in that consisting of a packing member (24f) for tightly fixed to the invasion (3) or oil pipe (5). The method of claim 3, wherein The probe 26 is formed through the discharge hole 26d having a predetermined inclination angle at the end of the through hole (26c) is formed in a predetermined depth so as to be in communication with the discharge tube (25). A body 26a; Mobile leakage inspection apparatus for an oil storage tank, characterized in that it is composed of a magnetic material (26b) extending to the body (26a) to attach the body (26a) to the bottom surface of the tank (1). The method of claim 3, wherein The discharge tube (25) is a mobile leakage inspection device for an oil storage tank, characterized in that consisting of a flexible tube so as to be stretchable according to the depth of the tank (1). delete delete

Images